blog/syslog_trusted_timestamp___chain_of_trusted_timestamps_for_your_syslog.html

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   6     <title>Petter Reinholdtsen: syslog-trusted-timestamp - chain of trusted timestamps for your syslog</title>
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  14  <h1>
  15      <a href="http://people.skolelinux.org/pere/blog/">Petter Reinholdtsen</a>
  16
  17  </h1>
  18
  19 </div>
  20
  21
  22     <div class="entry">
  23       <div class="title">syslog-trusted-timestamp - chain of trusted timestamps for your syslog</div>
  24       <div class="date"> 2nd April 2016</div>
  25       <div class="body"><p>Two years ago, I had
  26 <a href="http://people.skolelinux.org/pere/blog/Public_Trusted_Timestamping_services_for_everyone.html">a
  27 look at trusted timestamping options available</a>, and among
  28 other things noted a still open
  29 <a href="https://bugs.debian.org/742553">bug in the tsget script</a>
  30 included in openssl that made it harder than necessary to use openssl
  31 as a trusted timestamping client.  A few days ago I was told
  32 <a href="https:/www.difi.no/">the Norwegian government office DIFI</a> is
  33 close to releasing their own trusted timestamp service, and in the
  34 process I was happy to learn about a replacement for the tsget script
  35 using only curl:</p>
  36
  37 <p><pre>
  38 openssl ts -query -data "/etc/shells" -cert -sha256 -no_nonce \
  39   | curl -s -H "Content-Type: application/timestamp-query" \
  40          --data-binary "@-" http://zeitstempel.dfn.de > etc-shells.tsr
  41 openssl ts -reply -text -in etc-shells.tsr
  42 </pre></p>
  43
  44 <p>This produces a binary timestamp file (etc-shells.tsr) which can be
  45 used to verify that the content of the file /etc/shell with the
  46 calculated sha256 hash existed at the point in time when the request
  47 was made.  The last command extract the content of the etc-shells.tsr
  48 in human readable form.  The idea behind such timestamp is to be able
  49 to prove using cryptography that the content of a file have not
  50 changed since the file was stamped.</p>
  51
  52 <p>To verify that the file on disk match the public key signature in
  53 the timestamp file, run the following commands.  It make sure you have
  54 the required certificate for the trusted timestamp service available
  55 and use it to compare the file content with the timestamp.  In
  56 production, one should of course use a better method to verify the
  57 service certificate.</p>
  58
  59 <p><pre>
  60 wget -O ca-cert.txt https://pki.pca.dfn.de/global-services-ca/pub/cacert/chain.txt
  61 openssl ts -verify -data /etc/shells -in etc-shells.tsr -CAfile ca-cert.txt -text
  62 </pre></p>
  63
  64 <p>Wikipedia have a lot more information about
  65 <a href="https://en.wikipedia.org/wiki/Trusted_timestamping">trusted
  66 Timestamping</a> and
  67 <a href="https://en.wikipedia.org/wiki/Linked_timestamping">linked
  68 timestamping</a>, and there are several trusted timestamping services
  69 around, both as commercial services and as free and public services.
  70 Among the latter is
  71 <a href="https://www.pki.dfn.de/zeitstempeldienst/">the
  72 zeitstempel.dfn.de service</a> mentioned above and
  73 <a href="https://freetsa.org/">freetsa.org service</a> linked to from the
  74 wikipedia web site.  I believe the DIFI service should show up on
  75 https://tsa.difi.no, but it is not available to the public at the
  76 moment.  I hope this will change when it is into production.  The
  77 <a href="https://tools.ietf.org/html/rfc3161">RFC 3161</a> trusted
  78 timestamping protocol standard is even implemented in LibreOffice,
  79 Microsoft Office and Adobe Acrobat, making it possible to verify when
  80 a document was created.</p>
  81
  82 <p>I would find it useful to be able to use such trusted timestamp
  83 service to make it possible to verify that my stored syslog files have
  84 not been tampered with.  This is not a new idea.  I found one example
  85 implemented on the Endian network appliances where
  86 <a href="http://help.endian.com/entries/21518508-Enabling-Timestamping-on-log-files-">the
  87 configuration of such feature was described in 2012</a>.</p>
  88
  89 <p>But I could not find any free implementation of such feature when I
  90 searched, so I decided to try to
  91 <a href="https://github.com/petterreinholdtsen/syslog-trusted-timestamp">build
  92 a prototype named syslog-trusted-timestamp</a>.  My idea is to
  93 generate a timestamp of the old log files after they are rotated, and
  94 store the timestamp in the new log file just after rotation.  This
  95 will form a chain that would make it possible to see if any old log
  96 files are tampered with.  But syslog is bad at handling kilobytes of
  97 binary data, so I decided to base64 encode the timestamp and add an ID
  98 and line sequence numbers to the base64 data to make it possible to
  99 reassemble the timestamp file again.  To use it, simply run it like
 100 this:
 101
 102 <p><pre>
 103 syslog-trusted-timestamp /path/to/list-of-log-files
 104 </pre></p>
 105
 106 <p>This will send a timestamp from one or more timestamp services (not
 107 yet decided nor implemented) for each listed file to the syslog using
 108 logger(1).  To verify the timestamp, the same program is used with the
 109 --verify option:</p>
 110
 111 <p><pre>
 112 syslog-trusted-timestamp --verify /path/to/log-file /path/to/log-with-timestamp
 113 </pre></p>
 114
 115 <p>The verification step is not yet well designed.  The current
 116 implementation depend on the file path being unique and unchanging,
 117 and this is not a solid assumption.  It also uses process number as
 118 timestamp ID, and this is bound to create ID collisions.  I hope to
 119 have time to come up with a better way to handle timestamp IDs and
 120 verification later.</p>
 121
 122 <p>Please check out
 123 <a href="https://github.com/petterreinholdtsen/syslog-trusted-timestamp">the
 124 prototype for syslog-trusted-timestamp on github</a> and send
 125 suggestions and improvement, or let me know if there already exist a
 126 similar system for timestamping logs already to allow me to join
 127 forces with others with the same interest.</p>
 128
 129 <p>As usual, if you use Bitcoin and want to show your support of my
 130 activities, please send Bitcoin donations to my address
 131 <b><a href="bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b</a></b>.</p>
 132 </div>
 133
 134       <div class="tags">Tags: <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet</a>.</div>
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 409 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/10/">October (9)</a></li>
 410
 411 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/11/">November (13)</a></li>
 412
 413 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
 414
 415 </ul></li>
 416
 417 <li>2009
 418 <ul>
 419
 420 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
 421
 422 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
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 440 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
 441
 442 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
 443
 444 </ul></li>
 445
 446 <li>2008
 447 <ul>
 448
 449 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
 450
 451 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
 452
 453 </ul></li>
 454
 455 </ul>
 456
 457
 458
 459 <h2>Tags</h2>
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 482  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (158)</a></li>
 483
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 588  <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (42)</a></li>
 589
 590 </ul>
 591
 592
 593     </div>
 594     <p style="text-align: right">
 595  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 596 </p>
 597
 598   </body>
 599 </html>